金剛般若經疏論纂要 2.238

2.238

偈云「去來化身佛，如來常不動。」大雲云：「眾生心水若清淨，則見佛來，來無所從；濁則見雙林示滅，則云佛去，去無可至。」肇云：「解極會如，體無方所，緣至物現，來無所從；感畢為隱，亦何所去？」

The verse says: "Coming and going is the nirmāṇakāya Buddha; / The Tathāgata is eternally unmoving." Dayun says: "If the water of sentient beings' minds is pure, then they see the Buddha come, yet his coming has no origin; if it is turbid, they see him demonstrate extinction between the twin trees, and thus say the Buddha goes, yet his going has nowhere to reach." [Seng]zhao says: "His understanding is consummate and accords with suchness; his essence has no spatial location. When conditions arrive, he manifests to beings, coming from nowhere; when responsiveness ends, he conceals himself, and to where would he go?"